[Qgis-user] Generating GeoTIFF overview ("gdaladdo -r gauss ...") takes days for 2GB file...

[Ziegler Stefan]

Does it perform (in qgis?) fastest with *gauss* overviews or did you try also *nearest*? 

Regards
Stefan

Von meinem iPhone gesendet

> Am 18.10.2014 um 00:17 schrieb Stefan Keller <sfkeller at gmail.com>:
> 
> Hoi Stefan
> 
> No it doesn'nt need to be gauss resampling method.
> We found that GeoTIFF with overview index performs fastest.
> 
> Yours, S.
> 
> 2014-10-13 15:22 GMT+02:00 Ziegler Stefan <Stefan.Ziegler at bd.so.ch>:
>> Hi Stefan
>> 
>> Does it need to be "gauss" as resampling method? You can use QGIS' own resampling functionality to get nice raster rendering.
>> 
>> Regards
>> Stefan
>> 
>>> -----Ursprüngliche Nachricht-----
>>> Von: qgis-user-bounces at lists.osgeo.org [mailto:qgis-user-bounces at lists.osgeo.org] Im
>>> Auftrag von Jonathan Moules
>>> Gesendet: Montag, 13. Oktober 2014 15:05
>>> An: 'Stefan Keller'; 'gdal-dev at lists.osgeo.org'; 'qgis-user'
>>> Betreff: Re: [Qgis-user] Generating GeoTIFF overview ("gdaladdo -r gauss ...") takes
>>> days for 2GB file...
>>> 
>>> Hi Stefan,
>>> How large is the image? As in, pixel width & height.
>>> 
>>> Also the GDALinfo would be helpful.
>>> 
>>> 7 days is a very long time. I've seen times like that myself for images that were
>>> 100,000*50,000 or similar dimensions where there was (still is?) an issue with the
>>> pyramiding function in GDAL (it was re-reading the data again and again).
>>> 
>>> Cheers,
>>> Jonathan
>>> 
>>> -----Original Message-----
>>> From: qgis-user-bounces at lists.osgeo.org [mailto:qgis-user-bounces at lists.osgeo.org]
>>> On Behalf Of Stefan Keller
>>> Sent: Sunday, October 12, 2014 1:34 PM
>>> To: gdal-dev at lists.osgeo.org; qgis-user
>>> Subject: [Qgis-user] Generating GeoTIFF overview ("gdaladdo -r gauss ...") takes days
>>> for 2GB file...
>>> 
>>> Hi,
>>> 
>>> I have a GeoTIFF file of 2GB size. Now, this question is about gdaladdo and how to
>>> optimize loading time of such a large raster file.
>>> 
>>> According to my observations QGIS has fastest loading times when it's a single
>>> GeoTIFF file with overview images.
>>> 
>>> Q.1: Does anybody have tipps for even faster solutions loading raster files into in QGIS
>>> (prepared by OGR or other preprocessors)?
>>> 
>>> The command "gdaladdo -r gauss C:\SG.tif  2 4 8 16 32 64 128 256"
>>> takes actually about 7 days on a Lenovo notebook.
>>> 
>>> Q2.: Any hint's on how to accelerate this (or to other tools generating
>>> overviews/pyramids)?
>>> 
>>> Yours, S.
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